Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac2dd73ff09756c8…

MALICIOUS

PDF

83.1 KB Created: 2021-09-06 01:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2c8de7589124d08c664dfc12b68a55ab SHA-1: 9d8ac03007bd1a058dd3ae7f5de33a83ee75e08d SHA-256: ac2dd73ff09756c8e3bc8e8ffbb69819a14281f74eaacf239506ef9a3f2b2c85
156 Risk Score

Malware Insights

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

The PDF was flagged by a malicious ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a tactic to host malicious content or redirect users. The presence of a link farm on disposable hosting further supports a malicious purpose, likely to lure users to phishing or malware 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 https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/24ff525813f55e8412e0bd12bfcbfd5e/3825407831.pdf In PDF document text
    • http://aceonlinementors.com/userfiles/file/jinurozenuwuxelexoselaxiw.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611b9d186e290---83123281083.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba8a6cea6b---barizepivosojisudujole.pdfIn PDF document text
    • http://coytex.net//ckfinder/userfiles/files/16125185393.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/tujigivinusolitiw.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9c2238077---vogunivinomu.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/nbk4vg0nf72ol5ehm840u25tg2/70826577507.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/e6tlfqs4htmma34v8d0jnaj7nd/woxegirokipivaranobo.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/sidolaxumugulizivede.pdfIn PDF document text
    • http://normel.org/files/upload/file/ritujokidokewadabo.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/83185717890.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/56454055231.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3c4b94e2c4---vuvabewupugada.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/fozobirukatoniwixezeku.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/81007156602.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c773b459e85---27552196977.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/3c903a3cf6bf9d7da2557e2f03342247/nejuzibume.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/julawelusevotogi.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/12756943563.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/80184073153.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/r5pm3vtdga9phqai95phrdrac7/zogaba.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cdc062336aa---mamojuzepanabazirukezato.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b608b47dde8---86542457144.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/31644946959.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=ingenuity+moonlight+rocking+sleeper+zoo+zoo+zebra+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_off0000d947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD947 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15E 11280 bytes
SHA-256: a81742d0b2ceb1f4eeddf9d97b3bd325108ba11802ecb1c5622091cb2ebc7885
font_02_sfnt_off00010b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B83 19268 bytes
SHA-256: e77f1758c7ecfe4707136efa845e54e5f7368919ea7ac80b8e30fbdd510a29cd

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