Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ac814ac0480708c…

MALICIOUS

PDF

83.2 KB Created: 2021-09-05 23:25:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 8dbd3692e627ed8e066e570b1c415463 SHA-1: 08c332e606f775af1537ba0c726785e4e561c001 SHA-256: 1ac814ac0480708ca77cc50e51eacb7c1f432031eaa51acf6174c257950d1ad4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing lures designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://apcmagon.com/userfiles/9371277741.pdf In PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134b73940cd3.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/a6674134ceef2c74cdc8c2ddbdc26a7b/mekiveji.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/51908511211.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/n1si1fp2fe41eh6694682j4g82/seteroga.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de255af08a---fugeful.pdfIn PDF document text
    • http://teknis.it/userfiles/files/xevutete.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/gikilewidigetug.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/otad9dc4so4q72fia2p9bj7r1f/dibotilizilidejupadum.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/pojewelerowanefu.pdfIn PDF document text
    • http://dkyangmei.com/uploadfile/file/2021062003300673499.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/42329668474.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/rulofoniwotibaxi.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16129449545d77---digoparusapakoleg.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/65208073587.pdfIn PDF document text
    • http://carbonelite.ru/file/73588082957.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/jaqb160ovhdrl1hutn9c57d9h8/83056505828.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/voretiwebupu.pdfIn PDF document text
    • http://mastersequipments.com/ckfinder/userfiles/files/77204754846.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/vevulifabatiwin.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/modipa.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/1f83d0e0e7cd6c4d61b22678c943e368/juvebuzek.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/454dcd091e87f7f6993f3f965a2f04db/zigafefuxawanu.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/pid04tnuvlm4iguuolgeqjo861/79827385576.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=sujet+de+brevet+fran%C3%A7ais+2019+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_off0000d91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91F 11496 bytes
SHA-256: dd29742836b67d1bf79877b38ea9db294cb7584f242b15ad60dbe62404fdb6f9
font_01_sfnt_off0000f450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF450 19208 bytes
SHA-256: 470b923049430150b6686af3880d7c3cab24669d5dc31333d05fb38c43411eaa
font_02_sfnt_off000124ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1