Malicious PDF — malware analysis report

Static analysis result for SHA-256 afd7721486e7d21b…

MALICIOUS

PDF

81.8 KB Created: 2021-10-04 23:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b6de78256cdb29cefea0a27766f51c02 SHA-1: ba23ce538dc5e412aec10f2eb6f15483257b5f89 SHA-256: afd7721486e7d21b1c6089f4d229b402e19a4fd9a74073b3626a718c2145cae1
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to various domains, many of which appear to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to drive traffic to these external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://smidgel.ru/uplcv?utm_term=how+to+write+an+email+for+a+friend PDF link annotation
    • http://psn-monolit.ru/img_file/files/62937895539.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/sipawitupifofunuxudotum.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/lixanusokufagagudodu.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/gugalixewum.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/8b6e6bdca0c38e199378ee84da7d08aa/xusijoluxogawa.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/vosusiwurafasafiligij.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16150827cd70de---tesururelidilepozap.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/11794914168.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/bivera.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/munapewaxifa.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/88697701927.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109152147505186.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210908032258_1607039097.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/19373294188.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/45542019445.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/rozanawome.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/mezixixisukamapikajosi.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/33052333998.pdfIn PDF document text
    • https://khonggiansangtao.com/platformecom/img/upload/file/26308439448.pdfIn PDF document text
    • http://chieucoingason.vn/files/93494281014.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/nuzinolobijipojegov.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/58910292701.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16139cd36ec992---17332981874.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_off0000d826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD826 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF038 19160 bytes
SHA-256: f6e95d7cd1a6a0984e08f4f06105603de78a061954fe57797f8829865b18defd
font_02_sfnt_off00012203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12203 10424 bytes
SHA-256: a5bd7c17a0a76f6bb57505ad12f6c3f6bdd6e743623860bcab4b9087e7a8e9a3

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