Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fae66c772fa3b77…

MALICIOUS

PDF

68.2 KB Created: 2021-09-24 23:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 546c9f3eb1797bba83f22210b2ddb5e4 SHA-1: 36e59cbab57ad2f7343440479865d18bb490f1e6 SHA-256: 2fae66c772fa3b7721def511f2c4dfe1796b22a7ce3c4a4b6ba204c66469db7e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The heuristic 'PDF_IMAGE_LURE' indicates the document is likely image-based with a hidden clickable action, designed to trick users into interacting with the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://smidgel.ru/uplcv?utm_term=derivative+for+exponential PDF link annotation
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/k51c0bag4s9humgk1fng4nb104/muwewiwolinizijegepinepa.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8b4050210---widuwivabasefopitilireve.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/16033087597.pdfIn PDF document text
    • http://mediacast.vn/ckeditor/upload/files/putizinofuxarovumul.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300e7688a5a---xatobakawavibove.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bd23e5691---12528822580.pdfIn PDF document text
    • http://classtool.info/upload/files/wegifekewejifi.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/a1986098ddd801266dea988f7f81531f/lazoxojaremenu.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/84860157792.pdfIn PDF document text
    • http://qishuochem.com/siicea/userfiles/file/97359517576.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/5490b2129aef4765f913b3adb7cf3471/1727144708.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/jobobili.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/12893554788.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/10727747389.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/82515150516.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/47365905485.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021916023331318.pdfIn PDF document text
    • http://rsentco.com/upload/file/90699158215.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/65824001002.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/53447333544.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/16136c63c8f74d---70240442337.pdfIn PDF document text
    • http://totoumi.jp/upload/file/komuferajaletadi.pdfIn PDF document text
    • http://lavalnerina.com/userfiles/file/tavepewetosibuj.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/tegosowadopowi.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/18443927115.pdfIn PDF document text
    • 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_off0000afd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E7 14480 bytes
SHA-256: b8cf919a0c12373247837db6d82ad46322c1f76db2b3f24e579a81efd0b42fc0
font_02_sfnt_off0000ebde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDE 10352 bytes
SHA-256: 43a01a700398366eb1f6ed3d4af3e0fd81e222348a8114471fa79710faf38f35

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