Malicious PDF — malware analysis report

Static analysis result for SHA-256 8912aa817dbeb102…

MALICIOUS

PDF

100.7 KB Created: 2021-07-28 02:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 91df6f89d02e604bdf3257a529865ab9 SHA-1: 4aec86afee2394e5fa18ea06b815a34e81890187 SHA-256: 8912aa817dbeb102615742066f82fd9a698fe68439b1d9db0cd2f9af1544463b
196 Risk Score

Malware Insights

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

This PDF document was flagged by ClamAV as a phishing trojan and by a machine learning classifier. The 'SE_CLICKFIX' heuristic indicates the document likely attempts to trick the user into running a command, a common social engineering tactic. While no scripts were directly extracted, the presence of numerous links to potentially compromised websites suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/47568275495.pdf In PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/lujepiratogewaniluji.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4b8233c3a57a3f02e5555f9cc5ba9cb4/rumojutazizadavejewadovab.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c4938de6fc5---fepavepobakeselo.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/85718068213.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b01c9a0fa13---dijasewixitot.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608495c26de10---welikagofodirajaduneze.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b673c0bd2---pewadutoruwape.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/40254488590.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a72115bb22a---gexadoginubo.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/d0004ad6e17bf47a338b5894d50e9a99/77716033585.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/fc2716ea2d5104b06f1c02a5c3dad2c5/xosupumolevadivud.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/63004095037.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/68975175005.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/da40839440e588732291a7c13d0ecedd/vetexozatege.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160924304a975e---91126996874.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/6708879334.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/eeafa7a74d6041cfda980014423b958b/17159438779.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/56424433080.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/vosanan.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210603_C2E2346EE5F27376.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/eb5f5238ae9237cfc4ec1815f3bacbbd/10748933717.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a88180bbaa6---dilelodumilunemijazijipen.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/22f1cb121805d16865be91447456ffd1/kemelakirabij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=minecraft+inventory+pets+mod+1.7+10PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12501 11200 bytes
SHA-256: f84305fe08ae80f43fabb83e0ae5f41f00abfdc48d1bb3860a53a6738f01016a
font_02_sfnt_off00013f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F5A 16064 bytes
SHA-256: a013ce2342554bbd70a9f85285a6053b67e9b25eaba0dd22223cc179b1b1ea16
font_03_sfnt_off0001546a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1546A 17376 bytes
SHA-256: e65dc043b20eee8c2e2b0f6fdb6efd7affd2adb3ea40a4199398db8699436868

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