Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a2ce3e7d35bcd3…

MALICIOUS

PDF

100.9 KB Created: 2021-07-05 13:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 11027ea531723661fa316c4377b6d34e SHA-1: 9c58f7c2c5e5398f1051acac1750cf4bffdc919d SHA-256: 83a2ce3e7d35bcd39f95687520f7a2abd1568af81d032b87243a318f818fa501
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan-like behavior. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the structure and URL patterns strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9803

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://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/38697ce2f0c03c16ec4368f0a2b8a250/lajiririvoruxet.pdf
    • http://atthaya.com/file_media/file_image/file/12806231465.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9e6c9a8cb---99059969330.pdf
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/mevasisurumevudigalebag.pdf
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/3488515817.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c14ff3d297e---jabalovafivom.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/8ac81536286fb21487b1c1e9c731063e/33053715476.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b0f08a910---midolotizidutasore.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b77495f12c---44038121291.pdf
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/17879296853.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/e3c7c922885057e26a9ef97f2c9635c2/29493735393.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f8dd511a8---mosofugubigobosalewejasel.pdf
    • http://anhuifan.com/upload_fck/file/2021-6-6/20210606124648548741.pdf
    • https://cowichanseniors.ca/userfiles/file/zazisaketidenu.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/35139bf3483366d9921554f2053f4187/44084467752.pdf
    • https://mclandpin.com/calisma2/files/uploads/92191241169.pdf
    • http://simonide.org/userfiles/file/jujola.pdf
    • http://cayxaotamphan.net/userfiles/image/file/71712042718.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adcebf1c80d---vatizozesew.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/fd7c3d0490e8bdfc8c36eeee34a1d51c/ruzomi.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160db5ea79a8aa---76749872781.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2ff92da26---fikerove.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/fmi16iui5rq24h1inut035o1d6/wijobozi.pdf
    • https://kltccompany.com/ckfinder/userfiles/files/garilid.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777d045fed2---65209737397.pdf
    • http://driver-jazda.pl/upload/file/16315386510.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=12th+computer+science+book+in+tamil
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012554.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12554 16792 bytes
font_01_sfnt_off00013d66.bin
32a48dd8e614a61118b4645025b89765d6375d3bf3ee7a1dd0d27e00b7e8e191
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D66 18128 bytes
font_02_sfnt_off00016d01.bin
c749a24bd24cfae75f8d9619a726b478feeb5bddc25f9ff73756334c64edab68
pdf-font-stream PDF embedded font (sfnt) at offset 0x16D01 11048 bytes