Malicious PDF — malware analysis report

Static analysis result for SHA-256 54374aa794ce5987…

MALICIOUS

PDF

86.9 KB Created: 2021-06-29 11:44:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 366c8e3f37ff09cb1eba7223aa75e69f SHA-1: beed4d06bf6e6ab0552501df20ae6ead57dd3b75 SHA-256: 54374aa794ce5987700822858a1abbb9c78a31336ae1a899f06ee1004f6eeaac
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains heuristics indicating it's a link farm and attempts to lure the user into enabling macros or executing commands via the clipboard. These lures suggest the document's primary purpose is to trick the user into downloading and executing a second-stage payload, likely a Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://olversonfamilyreunion.org/clients/5/51/51a48c89da211807e19ed56f8a1a1822/File/virorakezegotu.pdf In PDF document text
    • http://jiuxingchaoshi.com/uploads/file/310850474575.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a164267fb9c---71835870676.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/d48000b21f1983e50406bc1f407a1f82/1784449592.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210629093552.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jopexagoma.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160923bf35fa7a---fijovodametadezasifajeg.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/76d82425ebc95055022914edda1487b2/56598878489.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/8f4216b919181d2ebaec09877271eab7/78777441389.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/cd5719e38d0bb698b2be9b90abeecd80/zeledizerifar.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/1561420267.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/90892865874.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecdfaac976---63030910610.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/8951322fef6dba3f8feefe23e701fa55/20743893324.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16077e56d23c10---pexebozotovowedu.pdfIn PDF document text
    • http://short-story.ru/upload/file/54220439538.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/e23918b6871c04fb309989a6039f8d6c/68519441551.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/xeseka.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c70675dcb28---92729459226.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f8808319a---37163401854.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/10638999707.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766d5befe26---sopabajug.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/88295722610.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/7f9ba3a60833526316eadab467b029e9/kodiworuweda.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/7eb4caa3cf93c2ffe1060267e7b55bb4/56137801652.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=ms+word+selection+is+lockedPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB2 10372 bytes
SHA-256: 8d2a678f6034495223db39ffd570e394497607e09a902cdd6dc681bac9bd2b04
font_01_sfnt_off00010651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10651 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E63 18056 bytes
SHA-256: 8c39885b3ff3fefc8cc90877b06b96fc6dc161c0c6ef9d9d9973eb8f607b7a6a

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