Malicious PDF — malware analysis report

Static analysis result for SHA-256 39cc9196efa0f1fd…

MALICIOUS

PDF

87.7 KB Created: 2021-07-26 00:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9e688717b7b8caf108ffcdee1659ce41 SHA-1: 7bc04eaf58fd6743dfa6d3d46f5514bc74796f03 SHA-256: 39cc9196efa0f1fd6404c6a57b90eb398e1778eb405609ea0f8bb685eaa35a6d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggest a link farm or phishing lure. The PDF structure and embedded links are consistent with attempts to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://e-fasteners.eu/media/file/77633088335.pdf In PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/vibaridolafamizegewemo.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/f83fa12e6b0c710b2b8c1cfbfe7958c3/89416579992.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2a2277cc1---25002127683.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210521141840495787wiglrl.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/2b938c20d979792e893caaff1128797f/71725518833.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160967b5394543---65399439757.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/4d7a7134030c090d0002e90c2170a9c8/vaxanokawirakenekise.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/tunese.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/96aa337ac61e142e898255b60ef4e712/69534614290.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/795261854ee480ee4d867c9c054c3c62/8812247595.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/fbd3ef3bb4b4498cb5413a592d984346/82353847103.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a7d16c309---nobudowum.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c65e5cb78d---gifikosuranulolopin.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/43c1cfe09823792fe71630e318ea998b/bozaxowitugemum.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/d9b32bc9e6e15ef07509d76f33b41e5c/nanij.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/e9arofft5vpogcq4s1ak8gv286/foxasisenin.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/13982726001.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7d9816cc2f---97857219555.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/lomerawosupumosu.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/b9be8f1208c734cca11c367e6ba4bfbf/61014616641.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/lulekefotuvigawi.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/vumupaxawusa.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/gupopawe.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/linivufusowiwidijeriwoso.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/cir62r0a7ikkr7mb23dhjuhcvu/80757699307.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080fc6700f83---jakopivawodagedobirozelon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=why+is+my+whirlpool+dryer+making+a+screeching+noisePDF 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_off0000f1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BA 17180 bytes
SHA-256: c449f46281c53fd0f8f674dbad0ff8f0f381647cc3eb47b7ce139d91ba1da4bc
font_01_sfnt_off00011eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13704 11148 bytes
SHA-256: ac22bfdf96a12df6aed57d5f198fd8b967164284c6d25a376f1893275ab9941b

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