Malicious PDF — malware analysis report

Static analysis result for SHA-256 a70d178716ddd6c9…

MALICIOUS

PDF

77.2 KB Created: 2021-07-30 18:31:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 36c4bfaa7bf54b06b00b835cf64f9319 SHA-1: a29f1a5b54b484056be02c3dd2c26ac1c8083840 SHA-256: a70d178716ddd6c985f934aebe365d0cc0c94b4c5468daddaa877d3a01960571
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The PDF structure itself is also flagged for suspicious link farming and duplicate object bodies, further supporting its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://chromatographvials.com/d/files/majedimetazisotive.pdf In PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607831e43e8f9---ledunugizanefezebariv.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b72afb619aa---geruloge.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885c5aae948---13249861040.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/82485909258.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/9e5362a10ca9a356c2283bf685111e40/39053648233.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608df724af5c9---tonubaxoveleb.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e9462e121---ramesivokebiz.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/d73093d66d3323a22689fd62e203ff4c/109968482.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/gatevasanefidi.pdfIn PDF document text
    • https://bojovicsirogojno.com//files/vemet.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/xugotutaredidedukafajo.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/fumirofumalulofo.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/97988918664.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/50268839686.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/6481b1a861fb86fc304038d77a0bc624/lolofuweruv.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/fdo8gtl176e39rlt5b9f0itgh9/nusujififudus.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/38187268889.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c887059bdaa---sokegabizokuwozukozuserus.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/839debeef848f59acc1fe06185f88d56/dejali.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/b3a5d456715781bd70b5380f7681455f/duwifunodaxekanalone.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/11953636127.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608e956072955---50820319132.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/6c128ee692c77aabe4d52c28eab364c6/linipikexu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=lumber+tycoon+2+axe+dupe+script+2021PDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC663 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7A 11336 bytes
SHA-256: 0ba300cb528cbf86bc5a77c2b777c303fe5bc3ce8dc6dd33b9d4267571bf96a3
font_02_sfnt_off0000f90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90E 17212 bytes
SHA-256: bc9eef144492d384379c00e86e06c975fc2fdf73acd8f2808c71757a4e476d73

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