Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa1077f41e3df986…

MALICIOUS

PDF

84.3 KB Created: 2021-09-21 16:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 79784b38af4eee1eedad33f68083c997 SHA-1: e11c7b86b82ffd9a5218018d8fbdd3cf4f15c825 SHA-256: aa1077f41e3df986d1e750c63112b20af43fb4e002d0aa20951f5ddc8aeda2cc
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting a link farm designed to lure users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of 'utm_term' parameters in URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=play+store+app+does+not+download PDF link annotation
    • https://eletvital.hu/uploads/files/papemebigoga.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/79956090882.pdfIn PDF document text
    • https://aksusu.com/upload/files/14056116317.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/siguporenona.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/bilojamibixit.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/42460064399.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/87902103379.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109100619542059.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/e902adcfac3c116ce32d8def136fd4a4/nezejogezobemumowuga.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/48098269965.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/luwemevikisevolidibudol.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/d636ceb452e31e3168aedf043bb8671c/dubomatisapedilejiwabas.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/75134167916.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/6c3cdcd702c6abdde8e3ba84a0c0b9cc/wepuxilununudizud.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/76175765259.pdfIn PDF document text
    • http://sivam.pl/files/file/vokupemiwarozujawesaw.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/53919777608.pdfIn PDF document text
    • http://arniuniversity.in/ci/userfiles/files/xumolotatirawevodetofev.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/15155599715.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/bixetameguverize.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/22075451761.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/21796655132.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/f361ebc336e2e00997ff5e5e96fe0588/38753631649.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/78670514984.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161395c70bdf9b---waxevadovoteso.pdfIn PDF document text
    • https://computerzone.pk/file/lupewenixugako.pdfIn PDF document text
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/xazajugerarafazuregekivo.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_off0000e4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCC 18128 bytes
SHA-256: 3353aede60ffc30f940a8e84ea5cf302191797ac84dbea111c1c73d5f9826285
font_02_sfnt_off00012b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2F 10492 bytes
SHA-256: fc008ed58b73081f3e87bf015801210471c86fe40db18721f09bd8d88a9240c0

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