Malicious PDF — malware analysis report

Static analysis result for SHA-256 94b53e8a4589cff6…

MALICIOUS

PDF

101.6 KB Created: 2021-09-01 22:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 899cd08f7a78a49d35374520f09b5cc1 SHA-1: 904a8fd23bb7f8e792a93973abcb786f30c06c27 SHA-256: 94b53e8a4589cff6e3f621cfe89c3f95dce9d2844c1f990ad02786f2b368847d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious files. Additionally, a visual download button lure was detected, reinforcing the phishing and download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608727151ce8a---rekubakajufulijudot.pdf In PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/580255e8e49f1be4bfd819d5d0056be0/81970089088.pdfIn PDF document text
    • http://makingthegradetexas.com/clients/d/d4/d4716c73f098ea79da165a2194b6736a/File/90800398831.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084d8c36b9b8---xewafefisul.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/9ab858d3e9e2d521231e13794381bfc5/70864195771.pdfIn PDF document text
    • http://esejsc.com/upload/files/jofiditi.pdfIn PDF document text
    • http://18554080.com/userfiles/file/23240988510.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c51725e5b91---76351429929.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/92647342377.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607634fde97e7---tegowomavudo.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/70093663086.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4f5531e1a---tuniviz.pdfIn PDF document text
    • http://oinworkshop.com/clients/6/6d/6d9161a7191ba42f41383a85782e2f4f/File/28289800472.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/65762349428.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/49885986466.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/wulezu.pdfIn PDF document text
    • http://azizolace.cz/images/file/69596529587.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/5448646416.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/julunup.pdfIn PDF document text
    • https://xn--mgbaf4adbs1bd2i.net/upload/ckfinder/files/titiruzekakijimevitoda.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/8793807059.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/48721164337.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210530083052.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3462918fb.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c27f2ae00e9---89200566242.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/70683119043.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/37437976504.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=acer+aspire+x1470+manualPDF 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_off00012526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12526 10800 bytes
SHA-256: 8762aec15456d79c9bbbbd0de116f52d68abe75e1f7a06675dfde45a153489bd
font_01_sfnt_off00013e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E1E 18956 bytes
SHA-256: 02e67265e4156b8bc877fa9d77486c7b0677562a58a8f006919111d9b6bf1bf4
font_02_sfnt_off00016fc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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