Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab449b5a8f5d69f2…

MALICIOUS

PDF

86.2 KB Created: 2021-09-05 05:42:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: caca26659cf197d13386af0b3a0b9f73 SHA-1: 104b76cec00238cbe48125f79a1602f9e0bd4b91 SHA-256: ab449b5a8f5d69f2ae8ebcb2c687b9614f6ba61fc5cd37ff79f1e0ea659d51b1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092e101ccd01---7702839487.pdf In PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4536c3c6d---jazelimufimunubalif.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/75563501508.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/79047741398.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/54052273552.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/77251284999.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/lagududemidiwuwugasaf.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/30329626693.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/aeb83755f410b58f13aefcb839fcc9cf/vulipulevevepi.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/gaxirub.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160974661f352f---gijesamejefuxuzavoxol.pdfIn PDF document text
    • https://ip-pharma.net/data/files/pejavopibuvivuxedevuviwop.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/teluwaged.pdfIn PDF document text
    • https://southafricapools.com/contents/files/negufatomururoka.pdfIn PDF document text
    • https://beatmuellerfoto.ch/userfiles/files/pebopimisizuxogetewuna.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/970c36e22876c6b3f0770da1450ab228/zazinonunarejetu.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/57372841720.pdfIn PDF document text
    • http://sanders-scottfamily.com/clients/26926/File/papabenujoleserofaradok.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/dufemexotinel.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/sru2pla1neanpnmd7lbhhpthc1/peregonafejabujebitilasak.pdfIn PDF document text
    • http://theshippyfamily.com/clients/57051/File/15639796670.pdfIn PDF document text
    • https://phunhai.net/upload/files/59534761956.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210708_170027.pdfIn PDF document text
    • http://meta-min.com/files/pawavawamugagojov.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b04198380b4---fudazi.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/53436991446.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=jazz+bass+guitar+lessons+pdfPDF 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_off0000e908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE908 18576 bytes
SHA-256: 862b00dad136659b9a261d5ba9c1e4ffa6130676b0aecf3d5c2905fb27266a58
font_01_sfnt_off00011963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11963 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001317a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1317A 10964 bytes
SHA-256: 2c2763afddf7ee5cab6838d7da9dd0e966667d9ca6acee1f4aaa74611c1c1d0c

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